Center extension table



Sept. 4, 1951 A. Hu'rcHERsoN 2,566,800

4 CENTER EXTENSION TABLE vFiled June 9, 1948 1 2 sheets-sheet 1 `1a y l 40.

a4 I f u. g a4 l IH 6 y AIII. a IIL?? 5 29 l 3335 3/ Il .l 1| ll llll. l .l -11 |l W' l 'I 23 |I 1l Il l W llm'l .EN ,Il I 6 'il |l|| 1 mf 4l 4' W11 lllll :i WHHHI .9

l 4 36 I6 l l7 38 4o 3l 32 29) 1|" 33 3 .lll |ll *ga-os---uxqF- I Il.. IMI 34 u l 1 l 9l 2a IN 34 L m NI /f i im. t- 4 I l I l Ili' 4.

l N V EN T 0R. Amr/e #um/mso.

Sept 4, 1951 A. HuTcHl-:RSON 2,566,800

CENTER EXTENSION TABLE Filed June 9, 1948 2 Sheets-Sheet 2 IIII Patented Sept. 4, 11951 UNITED STATES PATENT OFFICE CENTER EXTENSION TABLE y Archie Hutcherson, Detroit, Mich.

Application June 9, 1948, Serial No. 32,001

1 Claim. 1

. whereby the length of said stand may be longitudinally adjustable to accommodate a row of books for example.

It is the further object of this invention to provide a lcentral swivel element upon the' base of said stand, with said swivel element having a pair of oppositely arranged platform elements which are longitudinally and reciprocably ad- :justable with respect to each other for regulating the length of said platform.

It is the further object of this invention to provide in said swivel element a manually adjustable memberwhich isoperatively engagable with both of said platform elements whereby on operation of said manually adjustable member said platform elements may be horizontally moved towards or away. from each other upon said swivel element. 1

It is the still further object of this invention to provide rack gears in `association with said platform elements and movable therewith, being oppositely arranged with respect to each other and with the manually adjustable member carrying a pinion which i-s in mesh with both of said rack gears.

These and other objects will be seen from the following specification and claim in conjunction with the appended drawings in which:

Figure l is a side elevational view of the swivel stand.

Figure 2 is a plan view thereof.

Figure 3 is a left end elevational view thereof.

Figure 4 is an elevational section on lin-e 4-4 of Figure 2.

Figure 5 is an elevational section on line 5-5 of Figure 4.

Figure 6 is a fragmentary elevational section'. on line 6-6 of Figure 1; and

Figure '1 is a fragmentary eleva-tional section on line 1--1 of Figure 4.Y

It will be understood that the above drawings' illustrate merely a preferred embodiment of the invention, and lthat other embodiments are contemplated within the scope of the claim hereafter` set out.

Referring to the drawings,V the swivel stand consists of the circular stationary base II which has formed therein a central. circular recess I2 in its top surface as shown in Figures 4 and 5.

Substantially cylindrical swivel I3 is uprightly positioned within circular slot I2 which acts as a guide therefor, permitting manual 360 degree rotation thereof relative to base I I.

Rivet or bolt I4 extends downwardly from the bottom of central transverse slot I5 formed in swivel I3, and down through a corresponding central opening in baseV II, in suchA manner as to loosely retain saidv swivel Within the guide recess I2in saidbase. A

Longitudinally adjustable platform elements I6 and I1 are horizontally positioned upon the top surface of swivel Z13, platform element I6 having a pair of longitudinal dove-tail slots 20 formed in the inner surfaces ofits bifurcated elements I9, to cooperatively and guidingly receive the longitudinally arranged outwardly extending tongues I8 formed in the opposite side edges of platform element I 1.

Thus platform elements I6 and I1 are positioned in the same horizontal plane, however platform I6 has a central opening or longitudinal slot 2I within which platform I1 is adjustably movable respectively; At the Asame time said slots 20 provide a means of horizontally retaining platform I1 upon the top surface of swivel I3.

Rotatable shaft 22 is transversely jouirnalled through swivel I3 and centrally through its slot I5, having the handle 23 secured thereto at its outer end for rotating the same in one direction or the other. A pinion 24 is suitably secured upon shaft 22 within slot I5 in swivel I3 with suitable spacing washers 25 being provided upon shaft 22 upon opposite sides of said pinion.

A rack gear 26 depends downwardly from platform I1 being secured thereto for longitudinal reciprocal movements within slot I5, and with its teeth projecting downwardly and in mesh with the teeth of manually rotatable pinion 24.

A second oppositely arranged rack gear 21 is also positioned within the lower portion of slot I5 with its teeth extending upwardly in spaced relation to the teeth of rack gear 26, and being also in mesh with the teeth of pinion 24.

The forward end of rack gear 21 is interconnected with platform I6 by means of the intermediate blcck 28 whereby rack gear 21 lies in parallel spaced relation to the under surface of platform I6.

As both rack gears 26 and 21 are in operative mesh with pinion 24 upon opposite sides thereof,

' platform; el'errlentsl I:.6 and I'I.

Upwardlyextending stops 3I are arranged upon the opposite ends of guide bars 29 and are adapt;-

ed for respective engagement with cross-bars 32J and 33 secured respectively to platform elements;

I6 and I'I to limit outward adjustment thereof. As shown in Figure 4 a pair of upright rudderv shaped elements 34 are arrangedrandsecured togV the outer ends of platforms I6 and I1 being transversely notched at 35 to receive cross-bars 32 and 33 respectively which move with platfarms |16j and Iifandfwhichfcpoperatvelv:beanuponthe topsurface guidenharsir `Aaviewedfv in"lligima2;hollow,I lll-shaped element 36 isgsuitably-securedjtofplatform: I6; forlongetudinal;adjustment:therewith;beingfslobted@ai#3l to receive outwardly-r extend-ina s udebars 29. f Af. corresponding; U-shapedg element1 38;: is` op positely arrangedffrom Ll-shaled element. 36-,qbe-u ingr` secured. to2 platform: I.='I:' for: longitmiinall adjustifientJ therewith; there; alsdbeing; slots; 39; formed' therein to necevezguideebarsil relativelya to: whicht element.. is movable in.y unisonzwigth's platform I'LI` toawhiehlitfI isattachedi` The free ends of elements 3B; slidablyf project withinztheffreeiends off: element 3651in at'elescoping action whereby-f' intanylof the adjusted: posi,- tions: of! platforms. I6; andY IFF lsaid U-shaped", ele;-A mentsi 36 and 331ornamentaillyformf the; sidewalls ofv` a1 boat, forinstaneei 1A pairf oi.F upright; transversely varrangedi book-z end elements: on stopsillll are-.respectivelyrmounteA edl uporr platforms IIandf-y I'II with: thein; lowerbifurcated ends 4Il s'lidab'ly: extending downl through the correspond-ingtransverseopenings in platforms! l'land I'l Rollers3 42 are'fmountediupon the-lowerf endsloff thefbifurcated portionsfuiandare adaptedto co'-A operatively'- engageA` the samesurface upon which base ISIl is mounted2 tolfacilitatelrotary 'movement of said platforms and at the same time provide a secondary support for the outer ends thereof.

Detent means 43 are pivotally mounted upon the lower portions of bifurcated elements 4I within central slots 44 to normally prevent the upward removal of bifurcations 4 I, but which may be manually tilted inwardly within slots 44 whereby said bifurcated element 40 may be removed from the respective platforms if desired.

Having described my linuentiom reference should nowbe had to the' claim which' follows for determining the scope thereof.

I claim:

Incombination, a base, a pair of co-planar platform elements slidably mounted upon said basel-inhorizontal position, a pair of spaced longitudinally extending guide rails positioned above said platform elements and joined to said base imsub'stantially parallelrrelation to said platform elements, upwardly extending stops upon the outer ends ofi saidrails, and? transver-sebans carried by said. platform elements?, being' positioned-fv for; cooperative slidingg engagement: with the tonI `surfaces of said rails, the outward adjustmeritiof'l said platform elementabeing limited by, said bars enga-gingsaid stops EHI Number.y

VVHoffeHERsoN-a REFERENCES CITED;-

UNITED STATES PATENTSl Y 

